Mechanical behavior and flow curve modeling of AZ31B magnesium alloy under low frequency vibration assisted tension

Abstract

Abstract. This study aimed to investigate the impact of the low-frequency vibration field on the mechanical behavior of AZ31B magnesium alloy. To achieve this, a series of low-frequency vibration-assisted tensile tests were conducted at room temperature. The effect of various vibration parameters on the mechanical characteristics of AZ31B was studied. The findings indicate that the introduction of low-frequency vibration field during the traditional tensile process leads to periodic oscillations in the flow stress of the material. Moreover, the maximum stress value was greater than the condition without vibration. The vibration hardening value is not significantly affected by the vibration frequency, but rather depends on the amplitude. The magnitude of the vibration hardening value increases with the increasing amplitude, and this relationship is non-linear. On this basis, a modified Hockett-Sherby hardening model was constructed by incorporating the vibration parameters. Statistical analysis of stress-strain curve, vibration hardening and stress fluctuation values were conducted to identify the model parameters. By comparing with the experimental result, the stress change of AZ31B magnesium alloy under low frequency vibration tension could be well predicted by this model.